A cautionary note on thermal runaway reactions in mixtures of 1-alkyl-3-methylimidazolium ionic liquids and N-methylmorpholine-N-oxide

S Böhmdorfer, T Hosoya, T Röder, A Potthast, Thomas Rosenau

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)


    N-Methylmorpholine-N-oxide (NMMO) cannot be completely separated by extraction from mixtures with common 1,3-dialkylimidazolium ionic liquids (ILs) due to strong ionic interactions between the two components. At elevated temperatures, above approx. 90 degrees C, especially under dry conditions and in the presence of acid, alkylating or acylating agents, remaining NMMO in ILs tends to undergo autocatalytic degradation. This is a highly exothermic, unstoppable process that results in explosions, flames, and complete charring of the reaction mixtures. Thus, caution must be exercised when drying or heating ILs that were in previous contact with NMMO, and the absence of amine oxide must be confirmed to avoid potential danger.
    Original languageUndefined/Unknown
    Pages (from-to)1927–1932
    Number of pages6
    Issue number5
    Publication statusPublished - 2017
    MoE publication typeA1 Journal article-refereed


    • NMMO
    • Binary mixtures
    • Extractability
    • Exothermicity
    • Work safety

    Cite this